<template>
  <div>
    <!-- 面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/welcome' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <el-alert title="添加商品信息" type="info" show-icon center></el-alert>
      <el-steps :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <el-form ref="addGoodFormRef" :model="addGoodForm" :rules="addGoodFormRules" label-width="100px" label-position="top">
        <!-- v-model绑定的name -->
        <el-tabs v-model="activeIndex" tab-position="left" :before-leave="beforeTabLeave" @tab-click="tabClick">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
               <el-input v-model="addGoodForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
               <el-input v-model="addGoodForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
               <el-input v-model="addGoodForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
               <el-input v-model="addGoodForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
               <!-- 选择商品分类级联选择框-->
               <el-cascader
                   v-model="addGoodForm.goods_cat"
                   :options="catelist"
                   :props="cateProps"
                   @change="cateChange">
               </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="item1" v-for="(item1,index) in item.attr_vals" :key="index" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              :on-success="handleSuccess"
              :headers="headerObj"
              list-type="picture">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <quill-editor v-model="addGoodForm.goods_introduce"/>
            <el-button type="primary" class="btnAdd" @click="addGood">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 预览图片 -->
    <el-dialog title="预览图片" :visible.sync="previewVisible" width="50%">
      <img :src="previewURL" alt="" class="previewImg"/>
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data () {
    return {
      activeIndex: '0',
      addGoodForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 选择的商品列表
        goods_cat: [],
        pics: [],
        goods_introduce: '',
        attrs: []
      },
      catelist: [],
      // 级联选择框配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      addGoodFormRules: {
        goods_name: [
          {
            required: true,
            message: '请输入商品名称',
            trigger: 'blur'
          }
        ],
        goods_price: [
          {
            required: true,
            message: '请输入商品价格',
            trigger: 'blur'
          }
        ],
        goods_weight: [
          {
            required: true,
            message: '请输入商品重量',
            trigger: 'blur'
          }
        ],
        goods_number: [
          {
            required: true,
            message: '请输入商品数量',
            trigger: 'blur'
          }
        ],
        goods_cat: [
          {
            required: true,
            message: '请选择商品分类',
            trigger: 'blur'
          }
        ]
      },
      manyTableData: [],
      onlyTableData: [],
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewURL: '',
      previewVisible: false
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    cateChange () {
      if (this.addGoodForm.goods_cat.length !== 3) {
        this.addGoodForm.goods_cat = []
      }
    },
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      this.catelist = res.data
    },
    beforeTabLeave (activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addGoodForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
    },
    tabClick () {
      if (this.activeIndex === '1') {
        this.getParamsData('many')
      } else if (this.activeIndex === '2') {
        this.getParamsData('only')
      }
    },
    async getParamsData (sel) {
      // 根据所选的面板id获取参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,
        {
          params: { sel: sel }
        })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数失败！')
      }
      console.log(res.data)
      if (sel === 'many') {
        // 转换标签数据
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else if (sel === 'only') {
        this.onlyTableData = res.data
      }
    },
    // 预览图片事件
    handlePreview (file) {
      this.previewURL = file.response.data.url
      this.previewVisible = true
    },
    // 删除图片事件
    handleRemove (file) {
      const filePath = file.response.data.tmp_path
      const i = this.addGoodForm.pics.findIndex(x =>
        x.pic === filePath)
      this.addGoodForm.pics.splice(i, 1)
      console.log(this.addGoodForm.pics)
    },
    // 图片上传成功后事件
    handleSuccess (response) {
      const picInfo = { pic: response.data.tmp_path }
      this.addGoodForm.pics.push(picInfo)
    },
    addGood () {
      this.$refs.addGoodFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项！')
        }
        // 执行添加的业务逻辑
        // lodash   cloneDeep(obj)
        const form = _.cloneDeep(this.addGoodForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addGoodForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
          this.addGoodForm.attrs.push(newInfo)
        })
        form.attrs = this.addGoodForm.attrs
        console.log(this.form)

        // 发起请求添加商品
        // 商品的名称，必须是唯一的
        const { data: res } = await this.$http.post('goods', form)

        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败！')
        }
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId () {
      if (this.addGoodForm.goods_cat.length === 3) {
        return this.addGoodForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>
